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Söderström F, Sindelar R, Olsson KW, Yousef S, Todorova D, Pestalozzi J, Mellander M, Raaijmakers R. Active versus restrictive ligation strategy for patent ductus arteriosus - A retrospective two-center study of extremely preterm infants born between 22 + 0 and 25 + 6 weeks of gestational age. Early Hum Dev 2024; 191:105976. [PMID: 38452632 DOI: 10.1016/j.earlhumdev.2024.105976] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/22/2023] [Revised: 02/27/2024] [Accepted: 02/28/2024] [Indexed: 03/09/2024]
Abstract
BACKGROUND Patent ductus arteriosus (PDA) in premature infants is associated with adverse clinical outcomes. Mode and timing of treatment are still controversial. Data are limited in the most extremely premature infants <26 weeks of gestational age (GA), where clinical problems are most significant and patients are most vulnerable. AIMS To investigate whether different approaches to surgical closure of PDA in two large Swedish centers has an impact on clinical outcomes including mortality in extremely preterm infants born <26 weeks GA. STUDY DESIGN Retrospective, two-center, cohort study. SUBJECTS Infants born at 22+0-25+6 weeks GA between 2010 and 2016 at Uppsala University Children's Hospital (UUCH; n = 228) and Queen Silvia Children's Hospital Gothenburg (QSCHG; n = 220). MAIN OUTCOME MEASURES Survival, bronchopulmonary dysplasia (BPD), and retinopathy of prematurity (ROP). RESULTS Surgical closure of PDA was more common and performed earlier at QSCHG (50 % vs 16 %; median age 11 vs 44 days; p < 0.01). Survival was similar in both centres. There was a higher incidence of severe BPD and longer duration of mechanical ventilation at UUCH (p < 0.01). There was a higher incidence of ROP, IVH and sepsis at QSCH (p < 0.05, p < 0.01 and p < 0.01). A sub-group analysis matching all surgically treated infants at QSCHG with infants at UUCH with the same GA showed similar results as the total cohort. CONCLUSION Earlier and higher rate of surgical PDA closure in this cohort of extremely preterms born <26 weeks GA did not impact mortality but was associated with lower rates of severe BPD and higher rates of severe ROP.
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Affiliation(s)
- Fanny Söderström
- Department of Women's and Children's Health, Uppsala University, Uppsala, Sweden; Neonatal Intensive Care Unit, Uppsala University Children's Hospital, Uppsala, Sweden
| | - Richard Sindelar
- Department of Women's and Children's Health, Uppsala University, Uppsala, Sweden; Neonatal Intensive Care Unit, Uppsala University Children's Hospital, Uppsala, Sweden
| | | | - Sawin Yousef
- Department of Women's and Children's Health, Uppsala University, Uppsala, Sweden
| | - Daniela Todorova
- Department of Pediatrics, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Sweden; Neonatal Intensive Care Unit, Queen Silvia Children's Hospital, Sahlgrenska University Hospital, Gothenburg, Sweden
| | - Joanna Pestalozzi
- Department of Pediatrics, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Sweden
| | - Mats Mellander
- Department of Pediatrics, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Sweden; Children's Heart Center, Queen Silvia Children's Hospital, Sahlgrenska University Hospital, Gothenburg, Sweden
| | - Renske Raaijmakers
- Department of Pediatrics, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Sweden; Neonatal Intensive Care Unit, Queen Silvia Children's Hospital, Sahlgrenska University Hospital, Gothenburg, Sweden.
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Xiong J, Todorova D, Su N, Kim J, Lee P, Shen Z, Briggs S, Xu Y. Stemness factor Sall4 is required for DNA damage response in embryonic stem cells. J Exp Med 2015. [DOI: 10.1084/jem.2123oia6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
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Bankova V, Koeva-Todorovska J, Stambolijska T, Ignatova-Groceva MD, Todorova D, Popov S. Polyphenols in Stachys and Betonica Species (Lamiaceae). ACTA ACUST UNITED AC 2014. [DOI: 10.1515/znc-1999-1104] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
Above-ground parts and roots from four Stachys species (S. germanica L., S. sylvatica L. and the Balkan endemics S. thracica Dav. and S. plumosa Griseb.) as well as o f three Betonica species (B. officinalis L. and the Balkan endemics B. bulgarica Deg. et Neic. and B. scardica Griseb.) were screened for phenols (phenylethanoid glycosides, flavonoid glycosides and the phenolic diterpene betolide). Three phenylethanoid glycosides, a flavonoid glycoside and the phenolic diterpene betolide were isolated and identified, most of them for the first time in the investigated species. The results obtained support the view that Stachys and Betonica are well separated genera.
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Affiliation(s)
- Vassya Bankova
- Institute of Organic Chemistry with Centre of Phytochemistry, Bulgarian Academy of Sciences, Sofia 1113, Bulgaria
| | | | | | | | - Daniela Todorova
- Institute of Organic Chemistry with Centre of Phytochemistry, Bulgarian Academy of Sciences, Sofia 1113, Bulgaria
| | - Simeon Popov
- Institute of Organic Chemistry with Centre of Phytochemistry, Bulgarian Academy of Sciences, Sofia 1113, Bulgaria
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Todorova D, Tupova M, Zapreva V, Milkova T, Kujumdjiev A. Transformation of Aminosteroids into Pharmacologically Active Amides of Phenolic Acids. ACTA ACUST UNITED AC 2014. [DOI: 10.1515/znc-1999-1-212] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Amides of cinnamic acid derivatives with 3α-and 3β-cholestanylamines, as well as with 3α-and 3β-amino-(2’-aminoethyl)-cholest-5-en were synthesized using dicyclohexylcarbodiimide (DCC) and 1-hydroxy-benzotriazole as efficient additives. Their structure was determined by UV and 1HNMR . 3β-Amino-(2’-aminoethyl)-cholest-5-en, amides of p-hydroxy-cinnamic acid 4 and 9, and N-cholest-5-en-3α-aminoethyl-di-(3’’,-phenyl-trans-2’’-propene)-amide 10 showed moderate antibacterial activity against Staphylococcus aureus
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Affiliation(s)
- Daniela Todorova
- Institute of Organic Chemistry with Centre of Phytochemistry, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
| | - Maria Tupova
- Institute of Organic Chemistry with Centre of Phytochemistry, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
| | - Veneta Zapreva
- Institute of Organic Chemistry with Centre of Phytochemistry, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
| | - Tsenka Milkova
- Institute of Organic Chemistry with Centre of Phytochemistry, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
| | - Atanas Kujumdjiev
- Institute of Microbiology, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
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Carbajal R, Courtois E, Droutman S, Magny J, Merchaoui Z, Durrmeyer X, Roussel C, Biran V, Eleni S, Renolleau S, Desfrere L, Todorova D, Boimond N, Mellah D, Bolot P, Coursol A, Vottier G, Brault D, Cimerman P. SFNP-16 - Epidémiologie des gestes douloureux et stressants en réanimation néonatale, Epippain2. Arch Pediatr 2014. [DOI: 10.1016/s0929-693x(14)71889-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Kim J, Nakasaki M, Todorova D, Lake B, Yuan CY, Jamora C, Xu Y. p53 Induces skin aging by depleting Blimp1+ sebaceous gland cells. Cell Death Dis 2014; 5:e1141. [PMID: 24675459 PMCID: PMC3973209 DOI: 10.1038/cddis.2014.87] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2013] [Revised: 02/05/2014] [Accepted: 02/07/2014] [Indexed: 12/18/2022]
Abstract
p53 is an important inducer of organismal aging. However, its roles in the aging of skin remain unclear. Here we show that mice with chronic activation of p53 develop an aging phenotype in the skin associated with a reduction of subcutaneous fat and loss of sebaceous gland (SG). The reduction in the fat layer may result from the decrease of mammalian TOR complex 1 (mTORC1) activity accompanied by elevated expression of energy expenditure genes, and possibly as compensatory effects, leading to the elevation of peroxisome proliferator-activated receptor (PPAR)γ, an inducer of sebocyte differentiation. In addition, Blimp1(+) sebocytes become depleted concomitantly with an increase in cellular senescence, which can be reversed by PPARγ antagonist (BADGE) treatment. Therefore, our results indicate that p53-mediated aging of the skin involves not only thinning through the loss of subdermal fat, but also xerosis or drying of the skin through declining sebaceous gland activity.
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Affiliation(s)
- J Kim
- Division of Biological Sciences, University of California, 9500 Gilman Drive, La Jolla, CA, USA
| | - M Nakasaki
- Section of Cell and Developmental Biology, University of California, 9500 Gilman Drive, La Jolla, CA, USA
| | - D Todorova
- Division of Biological Sciences, University of California, 9500 Gilman Drive, La Jolla, CA, USA
| | - B Lake
- Division of Biological Sciences, University of California, 9500 Gilman Drive, La Jolla, CA, USA
| | - C-Y Yuan
- Division of Biological Sciences, University of California, 9500 Gilman Drive, La Jolla, CA, USA
| | - C Jamora
- Section of Cell and Developmental Biology, University of California, 9500 Gilman Drive, La Jolla, CA, USA
| | - Y Xu
- Division of Biological Sciences, University of California, 9500 Gilman Drive, La Jolla, CA, USA
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Todorova D, Sergiev I, Alexieva V. Application of natural and synthetic polyamines as growth regulators to improve the freezing tolerance of winter wheat (Triticum aestivum L.). ACTA ACUST UNITED AC 2012. [DOI: 10.1556/aagr.60.2012.1.1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Wheat cultivars were grown as soil culture under normal growth conditions. Twoweek- old seedlings were exposed to 4°C for 6 h and then transferred to −12°C for 24 h in the dark. Twenty-four hours before freezing stress, some of the plants were sprayed with aqueous solutions of spermine, spermidine, putrescine, 1,3-diaminopropane (1,3-DAP) and diethylenetriamine (DETA). The data showed that freezing stress caused a decrease in the fresh weight, chlorophyll content and plant survival rate, accompanied by a simultaneous accumulation of free proline and the enhanced leakage of electrolytes. Preliminary treatment with polyamines caused a decline in electrolyte leakage and a considerable augmentation in proline quantity, indicating that the compounds are capable of preventing frost injury. Additionally, the foliar application of polyamines retarded the destruction of chlorophyll, and lessened fresh weight losses due to freezing stress. The synthetic triamine DETA was the most effective, having the most pronounced action in all the experiments, followed by the tetraamine spermine. The application of polyamines to wheat crops could be a promising approach for improving plant growth under unfavourable growth conditions, including freezing temperatures. The results demonstrate that treatment with polyamines could protect winter wheat by reducing the stress injuries caused by subzero temperatures.
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Affiliation(s)
- D. Todorova
- 1 Bulgarian Academy of Sciences Institute of Plant Physiology and Genetics Sofia Bulgaria
| | - I. Sergiev
- 1 Bulgarian Academy of Sciences Institute of Plant Physiology and Genetics Sofia Bulgaria
| | - V. Alexieva
- 1 Bulgarian Academy of Sciences Institute of Plant Physiology and Genetics Sofia Bulgaria
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Tsekova K, Ganeva S, Hristov A, Todorova D, Beschkov V. Simultaneous copper, cobalt and phenol removal from aqueous solutions by alternating biosorption and biodegradation. Water Sci Technol 2011; 63:2388-2394. [PMID: 21977665 DOI: 10.2166/wst.2011.464] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
A strategy for removal of heavy metals and phenol from wastewaters is proposed. It involves consecutive cation biosorption by fungi, phenol biodegradation by the yeast association Candida sp. 2326 + Candida sp. 2327 and regeneration. Copper and cobalt removal from aqueous solutions containing 80-120 mg/L phenol by biosorption, using Rhizopus archizus cells immobilized onto poly (vinyl alcohol), was investigated by conducting a series of batch experiments. The removal efficiencies were 81% for Cu and 5% for Co. The residual concentrations of Cu (1.9 mg/L) and of Co (9.5 mg/L) did not change the biodegradation dynamics of phenol. A quantitative biodegradation of 120 mg/L phenol proceeded within 22 h. After biodegradation of phenol, the removal efficiencies achieved by biosorption after regeneration were 90% for Cu and 44% for Co. It was found that copper and cobalt form positively charged complexes with phenol. This complex formation hinders the retention of Cu and Co by the biosorbent and reduces the uptake of their cations.
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Affiliation(s)
- K Tsekova
- Institute of Microbiology, Microbial Ecology Dept., Bulgarian Academy of Sciences, Acad. G. Bonchev, Str., bl. 26, 1113 Sofia, Bulgaria
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Tsekova K, Todorova D, Dencheva V, Ganeva S. Biosorption of copper(II) and cadmium(II) from aqueous solutions by free and immobilized biomass of Aspergillus niger. Bioresour Technol 2010; 101:1727-1731. [PMID: 19906526 DOI: 10.1016/j.biortech.2009.10.012] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/24/2009] [Revised: 09/17/2009] [Accepted: 10/07/2009] [Indexed: 05/28/2023]
Abstract
This study investigates the ability of Aspergillus niger resting cells entrapped into poly(vinyl alcohol) (PVA) network to remove Cu(II) and Cd(II) from single ions solutions. The performance of free and immobilized biosorbent was evaluated by equilibrium and kinetic studies. The PVA-immobilized fungal biosorbent removed Cu(II) and Cd(II) rapidly and efficiently with maximum metal removal capacities of 34.13 mg/g and 60.24 mg/g, respectively. These values of heavy metal uptake at equilibrium were higher than the amount of Cu(II) and Cd(II) removal by free biomass (17.60 mg/g and 69.44 mg/g, respectively). Biosorption equilibrium data were best described by Langmuir isotherm model. The biosorption kinetics followed the pseudo-second order model and intraparticle diffusion equation. The results obtained suggest that the immobilized biosorbent holds great potential for wastewater treatment applications.
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Affiliation(s)
- K Tsekova
- Microbial Ecology Department, Institute of Microbiology, Bulgarian Academy of Sciences, Acad G Bonchev Str, bl 26, 1113 Sofia, Bulgaria.
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Abstract
AIMS To investigate the relationship between growth, heavy metal ions uptake and participation of the antioxidant enzymes superoxide dismutase (SOD) and catalase (CAT) in the protection of Aspergillus niger B 77 against cadmium stress. METHODS AND RESULTS The stress response of the model fungal strain, under conditions of a wide range of Cd (II) ion concentrations, was investigated by determining the biomass formation, protein biosynthesis, SOD and CAT activities and heavy metal uptake in growing cells. Exposure to heavy metal ions induced an increase in protein content, heavy metal uptake and SOD activity, and a heavy decrease in CAT activity. CONCLUSION The results obtained indicated that the tolerance of A. niger to Cd (II) was correlated with the heavy metal uptake, reactive oxygen species generation in the cells and the efficiency of antioxidative defence system. SIGNIFICANCE AND IMPACT OF THE STUDY Evidence is provided for the possibility that oxidative stress plays a major role in the effect of Cd (II) ions on A. niger. These data could offer useful information when creating new strategies and methodological improvements for bioremediation with the participation of fungi.
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Affiliation(s)
- D Todorova
- The Stephan Angeloff Institute of Microbiology, Bulgarian Academy of Sciences, Sofia, Bulgaria
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Papantchev V, Hristov S, Todorova D, Naydenov E, Paloff A, Nikolov D, Tschirkov A, Ovtscharoff W. Some variations of the circle of Willis, important for cerebral protection in aortic surgery — a study in Eastern Europeans. Eur J Cardiothorac Surg 2007; 31:982-9. [PMID: 17448672 DOI: 10.1016/j.ejcts.2007.03.020] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/23/2007] [Revised: 03/05/2007] [Accepted: 03/06/2007] [Indexed: 10/23/2022] Open
Abstract
BACKGROUND During unilateral selective cerebral perfusion (SCP), via cannulation of the brachiocephalic trunk, the brain receives blood only through the right common carotid artery and the right vertebral artery. For perfusion of the contralateral (left) hemisphere it is counted on the competence of the circle of Willis (CoW). It is well known that variations of CoW are present in more than 50% of the people. Furthermore, these variations usually affect more than one vessel of the circle. The aim of the present work was to study the variations of CoW, which could have an impact on cerebral blood supply during unilateral SCP. METHODS AND MATERIALS We study 112 CoWs obtained from cadavers via routine dissection in the Department of Forensic Medicine of Medical University, Sofia. The external diameter of both vertebral arteries and all arteries that form CoW was measured with a caliper-gauge. RESULTS We identify the variations of CoW such as significant hypoplasy and/or lack of a branch of the circle. Bearing in mind the characteristics of the blood flow during unilateral SCP some of these variations were classified as significant during unilateral SCP. They were subdivided into groups according to most probable stroke site after unilateral SCP. CONCLUSIONS Because of the high percent of the variations, hemodynamically significant during unilateral SCP, a suggestion for routine preoperative CT-angio of CoW could be made. Furthermore, an intraoperative follow-up with NIRO, transcranial Doppler, EEG, and so forth could also be recommended.
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Affiliation(s)
- Vassil Papantchev
- Department of Anatomy and Histology, Medical University, 1 G. Sofiiski Street, 1431-Sofia, Bulgaria.
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Papantchev V, Paloff A, Hinova-Palova D, Hristov S, Todorova D, Ovtscharoff W. Neuronal nitric oxide synthase immunopositive neurons in cat vestibular complex: a light and electron microscopic study. J Mol Histol 2006; 37:343-52. [PMID: 17120106 DOI: 10.1007/s10735-006-9061-6] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2006] [Accepted: 09/21/2006] [Indexed: 11/26/2022]
Abstract
Nitric oxide is a unique neurotransmitter, which participates in many physiological and pathological processes in the organism. Nevertheless, there are little data about the neuronal nitric oxide synthase immunoreactivity (nNOS-ir) in the vestibular complex of a cat. In this respect, the aims of this study were to: (1) demonstrate nNOS-ir in the neurons and fibers, from all major and accessory vestibular nuclei; (2) describe their light microscopic morphology and distribution; (3) investigate and analyze the ultrastructure of the NOS I-immunopositive neurons, fibers, and synaptic boutons. For demonstration of the nNOS-ir, the peroxidase-antiperoxidase-diaminobenzidin method was applied. Immunopositive for nNOS neurons and fibers were present in all major and accessory vestibular nuclei. On the light microscope level, the immunopositive neurons were different in shape and size. According to the latter, they were divided into four groups--small (with diameter less than 15 microm), medium-sized (with diameter from 15 to 30 microm), large type I (with diameter from 30 to 40 microm), and large type II (with diameter greater than 40 microm). On the electron microscope level, the immunoproduct was observed in neurons, dendrites, and terminal boutons. According to the ultrastructural features, the neurons were divided into three groups--small (with diameter less than 15 microm), medium-sized (with diameter from 15 to 30 microm), and large (with diameter greater than 30 microm). At least two types of nNOS-ir synaptic boutons were easily distinguished. As a conclusion, we hope that this study will contribute to a better understanding of the functioning of the vestibular complex in cat and that some of the data presented could be extrapolated to other mammals, including human.
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Affiliation(s)
- V Papantchev
- Department of Anatomy and Histology, Medical University, Sofia 1431, Bulgaria.
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Abstract
Copper and cadmium inhibited the growth as well as citric acid production (depending on the heavy metal concentrations) by citric-acid-producing Aspergillus niger. Activity of citrate synthase was connected with citrate synthesis in the absence as well as in the presence of heavy metals. The activity of aconitase, and both NAD- and NADP-isocitrate dehydrogenases was strongly inhibited by copper. The contents of DNA and proteins in the cells decreased but the contents of lipids and polysaccharides increased considerably in the presence of both heavy metals.
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Affiliation(s)
- K Tsekova
- Institute of Microbiology, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
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Tsekova K, Dentchev D, Todorova D. Effect of Copper and Cadmium on Filamentous Fungi Belonging to Genus Aspergillus. BIOTECHNOL BIOTEC EQ 1999. [DOI: 10.1080/13102818.1999.10819024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
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Abstract
Cholesteryl 3",4"-dimethoxycinnamate (7) and a new synthesized o-coumaroyl ester of 3 beta-(2'-hydroxyethoxy)-cholest-5-en (13) exhibited a marked activity against poliovirus type 1 (Mahoney). Compound 7 showed an approximately 20-fold greater selectivity in its antiviral activity than compound 13. These compounds were selected from thirteen steryl esters of cinnamic acid derivatives through an in vitro antiviral screening against viruses belonging to taxonomic groups with causative agents of important human infectious diseases to which chemotherapy is indicated, i.e. Picornaviridae, Orthomyxoviridae, Paramyxoviridae and Herpesviridae.
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Affiliation(s)
- A S Galabov
- Institute of Microbiology, Bulgarian Academy of Sciences, Sofia, Bulgaria.
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Kalitchin ZD, Boneva MI, Milkova T, Todorova D. Study on the antioxidant activity of cholesteryl esters of some phenolic acids by chemiluminescence. Journal of Photochemistry and Photobiology B: Biology 1997. [DOI: 10.1016/s1011-1344(97)00090-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Christova K, Sholeva Z, Chipeva V, Najdenova M, Todorova D. Differentiation of Streptomyces Strains by Multilocus Enzyme Electrophoresis. BIOTECHNOL BIOTEC EQ 1997. [DOI: 10.1080/13102818.1997.10818929] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
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Kostov GK, Kotov SV, Ivanov GD, Todorova D. Study on the synthesis of perfluorovinyl-sulfonic functional monomer and its copolymerization with tetrafluoroethylene. J Appl Polym Sci 1993. [DOI: 10.1002/app.1993.070470417] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Drjankova-Dimitrova M, Todorova D, Vodova R, Deleva A. [Oral hygiene and the state of gingiva in stomatology students]. Stomatologiia (Sofiia) 1987; 69:4-7. [PMID: 3507106] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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Todorova D, Mladenov I, Markov M, Todorov S. Composition and structure of liquid polysulphide polymers. J Mol Struct 1984. [DOI: 10.1016/0022-2860(84)87177-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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